I got a bottle of Aurora Black today. Since I already have a bottle of Aurora Blue, this COMPLETES the whole collection! (Try that with Noodler's, I guess it'll be pretty hard just to KNOW what colors have been made)
All jokes aside, I find Aurora inks are really great. The black one is simply a deep/dark black without hint of any other color. The blue is a vibrant and saturated color that is just right (not too bright and not too dark). Moreover, the flow is so good that they make my pens write smoother.